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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d23229678c3a6c131a4605507ba2d6b68d5584e2d2b9d087f03cec7480ac180' 
  AND token = 'Iq8v8AKi58cqYRQwj+sOinnh2Cy+jPrRMJ0hChMMj1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}